Imbedded Nanocrystals of CsPbBr3 in Cs4PbBr6: Kinetics,Enhanced Oscillator Strength,and Application in Light‐Emitting Diodes |
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| Authors: | Junwei Xu Wenxiao Huang Peiyun Li Drew R. Onken Chaochao Dun Yang Guo Kamil B. Ucer Chang Lu Hongzhi Wang Scott M. Geyer Richard T. Williams David L. Carroll |
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| Affiliation: | 1. Center for Nanotechnology and Molecular Materials, Wake Forest University, Winston‐Salem, NC, USA;2. Department of Physics, Wake Forest University, Winston‐Salem, NC, USA;3. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Shanghai, P. R. China;4. College of Materials Science and Engineering, Donghua University, Shanghai, P. R. China;5. Department of Chemistry, Wake Forest University, Winston‐Salem, NC, USA |
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| Abstract: | Solution‐grown films of CsPbBr3 nanocrystals imbedded in Cs4PbBr6 are incorporated as the recombination layer in light‐emitting diode (LED) structures. The kinetics at high carrier density of pure (extended) CsPbBr3 and the nanoinclusion composite are measured and analyzed, indicating second‐order kinetics in extended and mainly first‐order kinetics in the confined CsPbBr3, respectively. Analysis of absorption strength of this all‐perovskite, all‐inorganic imbedded nanocrystal composite relative to pure CsPbBr3 indicates enhanced oscillator strength consistent with earlier published attribution of the sub‐nanosecond exciton radiative lifetime in nanoprecipitates of CsPbBr3 in melt‐grown CsBr host crystals and CsPbBr3 evaporated films. |
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| Keywords: | excitonic kinetics lead halide perovskites light‐emitting diodes nanoinclusions oscillator strength |
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